• The term RAID was coined by researchers at University of Berkley.
  • RAID stands for ‘Redundant Array of Inexpensive Disks’. Now, it is ‘Redundant Array of Independent Disks’ that signify the performance and reliability gains.


  • RAID is an advanced, specific, physical secondary storage media having increased/unlimited capacity, performance, and reliability. 
  • It is mass storage devices having multiple units of the storage media in parallel being used as a single secondary storage device such that its disk performance is improved too much. 


  • In RAID, the disks are organised as an array of disks.
  • The basic strategy used in RAID is to replace the large capacity disk drive with multiple smaller capacity disks so that the data on these disks is distributed to allow simultaneous access, thus improving the overall input/output performance.
  • It also allows an easy way of incrementing the capacity of the disk.

Levels & Categories of RAID

  • RAID has been proposed at various levels, to organised their work properly.
  • The levels 2 and 4 are not commercially offered.
  • There are following levels of RAID which are given below – 

Use/Applications of RAID

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